
1) Airline
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https://www.crosswordclues.com/clue/contrail

1) Airplane wake 2) Cloud 3) Condensation trail
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https://www.crosswordclues.com/clue/contrail

Contrails (z; short for `condensation trails`) or vapor trails are long, thin artificial (man-made) clouds that sometimes form behind aircraft. Their formation is most often triggered by the water vapor in the exhaust of aircraft engines, but can also be triggered by the changes in air pressure in wingtip vortices or in the air over the entire w.....
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http://en.wikipedia.org/wiki/Contrail
[network] Contrail is a social network developed by Microsoft for use on mobile devices using Windows Azure, with emphasis on privacy using data encryption. Contrail - Microsoft Research ...
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http://en.wikipedia.org/wiki/Contrail_(network)
[software] Contrail is partially funded by the FP7 Programme of the European Commission under Grant Agreement FP7-ICT-257438. Contrail also allows virtualization, alongside Infrastructure-as-a-Service, Platform-as-a-Service. and Hybred clouds. ...
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http://en.wikipedia.org/wiki/Contrail_(software)

condensation trail
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http://phrontistery.info/c.html

Trailing streak of condensed water vapor created in the air by heat from an aircraft engine at high altitudes; aka VAPOR TRAIL.
Found on
http://www.aerofiles.com/glossary.html

Contrails over Texas Image credit: Forrest M. Mims III A condensation trail that is left behind by a passing plane, typically a jet plane. Contrails form when hot humid air from jet exhaust mixes with environmental air of low vapor pressure (pressure due to water vapor alone) and low temperature...
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http://www.daviddarling.info/encyclopedia/C/contrail.html

A cloud-like stream formed in cold, clear air behind the engines of an airplane.
Found on
http://www.encyclo.co.uk/local/22268

A cloud-like stream formed in cold, clear air behind the engines of an aeroplane.
Found on
http://www.metcheck.com/OTHER/glossary.asp

[
n] - an artificial cloud created by an aircraft
Found on
http://www.webdictionary.co.uk/definition.php?query=contrail
condensation trail noun an artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust
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https://www.encyclo.co.uk/local/20974

a visible condensation of water droplets or ice crystals from the atmosphere, occurring in the wake of an aircraft, rocket, or missile under certain conditions. Also called
Found on
https://www.infoplease.com/dictionary/contrail
No exact match found.